w_treeview = GTK_TREE_VIEW(gtk_builder_get_object(builder, "treeview"));
model = gtk_tree_view_get_model(GTK_TREE_VIEW(w_treeview));
gtk_tree_sortable_set_sort_func(GTK_TREE_SORTABLE(model),
w_treeview = GTK_TREE_VIEW(gtk_builder_get_object(builder, "treeview"));
model = gtk_tree_view_get_model(GTK_TREE_VIEW(w_treeview));
gtk_tree_sortable_set_sort_func(GTK_TREE_SORTABLE(model),